NUT,PLAIN,EXTENDED WASHER,DOUBLE. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: DOUBLE HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.396 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.
This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-731-7486, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.
Verify compatibility with your specific system configuration before ordering.
| material | IRON ALLOY 660 OVERALL |
| nut_style | DOUBLE HEXAGON |
| thread_class | 3B |
| thread_series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| overall_height | 0.396 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN |
| thread_direction | RIGHT-HAND |
| washer_thickness | 0.065 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN |
| precious_material | SILVER |
| surface_treatment | SILVER OVERALL |
| width_across_flats | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| nominal_thread_size | 0.250 INCHES IN |
| washer_outside_diameter | 0.448 INCHES NOMINAL IN |
| NSN | 5310-00-731-7486 |
| WIDTH ACROSS FLATS | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| THREAD DIRECTION | RIGHT-HAND |
| WASHER THICKNESS | 0.065 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN |
| WASHER OUTSIDE DIAMETER | 0.448 INCHES NOMINAL IN |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |
| NOMINAL THREAD SIZE | 0.250 INCHES IN |
| PRECIOUS MATERIAL | SILVER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| THREAD CLASS | 3B |